The inner hose is synthetic nitrile with a stainless steel braid. The outer cover is full stainless steel. The kits are compatible with all fuels including gas, alcohol, methanol and nitromethane. The fuel hose is corrosion and fire resistant in addition to being exceptionally light in weight and flexible. Holley fuel line plumbing kits are the natural choice for those who want nothing but the best. AN fittings are included as shown.